1. Mendelian Genetics Part 1

2. Learning Objectives
Describe what an allele is and explain the difference between homozygous and heterozygous alleles

3. What is an Allele?
Allele for purple flowers
Allele for white flowers
Homologous pair of chromosomes
From Mom
From Dad
Allele - a version of a gene that is located at a specific position on a specific chromosome

4. Alleles are Represented by Letters
A a
From Mom
From Dad

5. Homozygous vs. Heterozygous
Homozygous - two alleles are identical (BB, bb)
Heterozygous - two alleles are different (Bb)

6. A a Capital Letters are Dominant Dominant Recessive Allele Allele
(Powerful, Influential)
Recessive Allele
(Withdrawn)

7. Dominant Masks Recessive
Dominant allele
= F F or F f
Recessive allele
= f f
An organism will always exhibit the dominant trait when present.

8. Genotype vs Phenotype
Phenotype - physical appearance of an inherited trait.
Genotype - genetic makeup of an organism.

9. YouTube Genotype vs. Phenotype

10. Stop Here